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<h3>
Sebastian Graf pushed to branch wip/dmdanal-precise-exn
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7601522602e95c4a1a013f0d24b3d57e8a213aee">76015226</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-04-06T17:46:26+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hopefully fix the perf regression
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<h4>1 changed file:</h4>
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compiler/GHC/Core/Op/DmdAnal.hs
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<h4>Changes:</h4>
<li id="1419e35d2402c23209a644b054c5a67aa4463451">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7601522602e95c4a1a013f0d24b3d57e8a213aee#1419e35d2402c23209a644b054c5a67aa4463451"><strong>compiler/GHC/Core/Op/DmdAnal.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -152,7 +152,7 @@ dmdAnal env d e = -- pprTrace "dmdAnal" (ppr d <+> ppr e) $</td>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">emptyDmdType</span> <span class="n" style="color: #333;">conDiv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">emptyDmdType</span> <span class="n" style="color: #333;">conDiv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Doesn't happen, in fact</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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155
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">unitDmdType</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">coercionDmdEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">co</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">DmdType</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">coercionDmdEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">co</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">conDiv</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dmdTransform</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">dmd</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -410,7 +410,7 @@ forcesRealWorld fam_envs = go initRecTc</td>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- search depth-first</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">DataConAppContext</span><span class="p">{</span> <span class="n" style="color: #333;">dcac_dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">dcac_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">field_tys</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">deepSplitProductType_maybe</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't check the same TyCon <span class="idiff left right">twice</span></span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't check the same TyCon <span class="idiff left right">more than n times</span></span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_tc'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkRecTc</span> <span class="n" style="color: #333;">rec_tc</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">strict_field_forces</span> <span class="n" style="color: #333;">rec_tc'</span><span class="p">)</span> <span class="n" style="color: #333;">field_tys</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -518,19 +518,35 @@ dmdTransform env var dmd</td>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformDictSelSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGlobalId</span> <span class="n" style="color: #333;">var</span> <span class="c1" style="color: #998; font-style: italic;">-- Imported function</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformSig</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">idStrictness</span></span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "dmdTransform<span class="idiff left right">" (vcat [ppr var, ppr (i</span>dStrictness var), ppr dmd, ppr res])</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformSig</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">globalIdStrictness</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">env</span></span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "dmdTransform<span class="idiff left right">:global" (vcat [ppr var, ppr (idStrictness var), ppr (globalI</span>dStrictness var), ppr dmd, ppr res])</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">sig</span><span class="p">,</span> <span class="n" style="color: #333;">top_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSigEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span> <span class="c1" style="color: #998; font-style: italic;">-- Local letrec bound thing</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fn_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformSig</span> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "dmdTransform" (vcat [ppr var, ppr sig, ppr dmd, ppr fn_ty]) $</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "dmdTransform<span class="idiff left right">:local</span>" (vcat [ppr var, ppr sig, ppr dmd, ppr fn_ty]) $</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isTopLevel</span> <span class="n" style="color: #333;">top_lvl</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">fn_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't record top level things</span></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">addVarDmd</span> <span class="n" style="color: #333;">fn_ty</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="n" style="color: #333;">mkOnceUsedDmd</span> <span class="n" style="color: #333;">dmd</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Local non-letrec-bound thing</span></span>
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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitDmdType</span> <span class="p">(</span><span class="n" style="color: #333;">unitVarEnv</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="n" style="color: #333;">mkOnceUsedDmd</span> <span class="n" style="color: #333;">dmd</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkConservativeSig</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="n" style="color: #333;">unitVarEnv</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="n" style="color: #333;">mkOnceUsedDmd</span> <span class="n" style="color: #333;">dmd</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"><span class="cd">-- | Returns 'idStrictness' or a conservative strictness signature for an</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- imported global variable for which 'idStrictness' is Top.</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="n" style="color: #333;">globalIdStrictness</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">globalIdStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTopSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkConservativeSig</span> <span class="n" style="color: #333;">emptyVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"><span class="n" style="color: #333;">mkConservativeSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"><span class="n" style="color: #333;">mkConservativeSig</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tryClearPreciseException</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">optimistic_sig</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_envs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is almost isomorphic to topSig, except for the Divergence!</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"> <span class="n" style="color: #333;">optimistic_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fvs</span> <span class="n" style="color: #333;">optimistic_args</span> <span class="n" style="color: #333;">conDiv</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"> <span class="n" style="color: #333;">optimistic_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">typeArity</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="n" style="color: #333;">topDmd</span></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -944,9 +960,6 @@ deleted the special case.</td>
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="n" style="color: #333;">unitDmdType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="n" style="color: #333;">unitDmdType</span> <span class="n" style="color: #333;">dmd_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">dmd_env</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">conDiv</span></span>
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"><span class="n" style="color: #333;">coercionDmdEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span></span>
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951
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"><span class="n" style="color: #333;">coercionDmdEnv</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getUniqSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">coVarsOfCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The VarSet from coVarsOfCo is really a VarEnv Var</span></span>
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